Filter-press



(No Model.)

J; JOHNSON. FILTER PRESS.

No. 402,455. Pate nted Apr. 30, 1889.

jiWll/i/ FIEL1.

INVENTDF'\ N. PETERS, Pholn-Lillmgmphun wmmn mn. 0.1:

UNITED, STATES PATENT OFFICE.

JOHN JOHNSON, OF BROOKLYN, NEW YORK.

FILTER-PRESS.

SPECIFICATION forming part of Letters Patent No. 402,455, dated April30, 1889.

Application filed September 8, 1888. Serial No. 284,878. (No model.)

To all whom it may concern.-

Be it known that I, JOHN JOHNSON, a citizen of the United States,residing at Brooklyn, in the county of Kings and State of New York, haveinvented certain new and useful Improvements in Filter-Presses and I dohereby declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

The object of my invention is to provide improved means of supportingand adjusting the filtering-cloths used in the cells between thediaphragms of filtering-presses, as hereinafter fully described,reference being made to the accompanying drawings, in which- Figure 1 isa side elevation of a diaphragm of a filter-press provided with myimproved cloth supporting and adjusting device. Fig. 2 is a transversesectional elevation of a series of diaphragms as they are used side byside in the press with the cloth supporting and adjusting devices andthe duplex filteringcloths of my invention. Fig. 3 is a detail of thebush-clamp used to clamp and pack the cloths tightly on the margins ofthe center openings of the diaphragms, through which the substance to befiltered flows along to the different cells'wi'thin the press.

The plates or diaphragms a are made in all respects the same asheretofore, except as to the devices for supporting and adjusting thefiltering-cloths b, which-according to my invention, consist of the bar0, extending the whole length of the top of the diaphragm, and adjustably supported a suitable distance above it, so as to be readilyshifted higher or lower, or towardor from the plate, the stud-screws dand thumb-nuts e being in this instance used for the purposes; but ofcourse any approved form of support and adjusting devices may be used,and the said bars being so that they enable the use of duplex cloths Z)to be used by hanging them at vthe middle across the bars, said duplexcloths being double the length of the ordinary single cloths and servingfor both sides of the dia phragm, and being thus adjustable for bothsides of the diaphragm at once,which economizes time and labor ascompared with adjusting each cloth separately, as they have to be whenmade and suspended separately, as heretofore done.

The adjustment of the cloths by shifting them higher or lower from timeto time is made necessary by the shrinking and stretching to which theyare subject in repeated use, which alters their center openingsrelatively to the center openings, f, through the diaphragms, aroundwhich the margins of the center openings of the cloths have to beclamped by the bush-clamps g h, to prevent escape of the substance to befiltered without passing through the cloths.

The bush g is internally threaded, and has one or more key-ribs, 1',formed on it to interlock with a corresponding recess or recesses in thecenter opening of the diaphragm, and p with as many eyelets as there arehooks to be suspended thereon, which, it will be seen, is morecomplicated and expensive than the contrivance of my invention, besidesnot being capable of holding and adjusting the cloths as evenly as mydevice.

Separate filter-cloths-one for each side of the diaphragmmay of coursebe hooked on or otherwise connected separately with my improvedbar-support, if desired, with the advantage of being attached at agreater number of points, so as to be held more evenly and so as to beadjusted alike and together at all points.

The cells of the press before mentioned are the spaces inclosedbetween-the concavities of the diaphragms at j, common to all presses ofthe like character, and wherein the substance to be filtered iscollected under high pressure and the fluid portion is forced throughthe cloths and down the grooved surfaces of the plates to the passageis, and thence out through the nozzle Z.

What I claim, and desire to secure by Letextending along the top of thesame and fixed ters Patent, is adj ustably toward and from the plate,and a l. The combination, with the diaphragm or duplex filtering-clothsuspended on said sup- 15 partitionplates severally in a filter-press,of port and each side of the plate, substantially 5 a filtering-clothsupport consisting of a bar as described.

extending along the top of the same and fixed In testimony whereof Iaffix my signature in adj ustably thereon toward and from the plate,presence of two witnesses. and a filtering-cloth suspended from saidbar, substantially as described. JOHN JOHNSON 1o 2. The combination,with the diaphragms or Witnesses:

partition-plates severally in a filter-press, of W. J. MORGAN, afiltering-cloth support consisting of a bar STEVE O. BYRNE.

